Vat dyestuffs



Patented June 9,1931 Y KARL 'rmnss Ann rnnonon AND WERNER znnwnox, onFRANKEQRT-ON-TI-IE-1ViAIN-FEGHENHEIM, GER-MANY,

AssIGNoRs roennnnnr. 'ANILIN wonizs. mo. on NEW TION or" DELAWARE VATnvns'rnrrs N'o Drawing. Application filed'iluly 23, i929. Serial I To..380,455, and in Germany August :2 7, 1928.

The present invention relates to vat dyestufl's. F

We havefound that excellent vat dyestufis are obtainable by condensing.4-alkyl-5-halogen-'Z-alkoXy-is'atin-alpha-derivatives W i t h compoundsof the followinggeneral formula:

' on i wherein R stands for a naphthylene or phenylene residue.

The reactionpreferably is'carried out'in,

the presence of a solvent, such, for instance, as benzene,chlorobenzene, nitrobenzene or the like, while'gently heating. Whenusing alwater may also beused as a pha-arylides,

dyestuffs thus obtainable-prob solvent. The

ably correspond 1 to i the following general:

formula I for alkyland Hlg for halogen.

They are valuable vat dyestufis yieldingon the" cotton fiberverybeautiful greenish-blue tints of good fastness properties. The newdyestufis are also very useful for printing cotton. r

The following examples serve to illustrate our invention but they arenot intended to limit it thereto; the parts being by weight (1) 18 partsof l-chloro-l-naphthol are dissolved in 100 parts of hot chlorobenzeneand'slowly mixed at a temperature of C.

1 with I a solution of 4-.methyl-5-chloro-7methoxy-isatin-alpha-chloride in chlorobenzene (prepared by. heating22.6 parts of 4% methyl-5-chloro-7-1nethoXy-isatin with 22 parts ofphosphorous pentachl-oride in 200 parts of chlorobenzene). The solutionis then heated to C. until the evolution of ably has the ItTEISS1 TER-,0E rRamironae-01sman-mem-i-ioonsr,a

YORK, n. Y., A, som one;

tion assumes a blue coloration and on cooling the dyestufi'precipitate'salmost entirely. After the dyestuff has been filtered,washed with alcohol and water anddrieditrepresents a blue crystallinepowder and probfollowing formula:

It as fcbaohi rr m the vfat' 'beautiful fast} greenish bluetints and isparticularlysuit i I p able forjprintin'g cotton.. s j i (2)22 partsof4-b1-" mo-1-na 11tho1' are dissolved in 150' parts of hot chlorobenzeneand .mix'edat a temperature of 40 C. with suction and washedwith alcoholand water.

dry state a blue powder dyeing cotton from a. yellow vat beautifulgreenish-blue tintg. 9f a more ni a -thanthoseobtai eaty fi I thedyestufi of Example 1. Itis partieu} Jlarlysuitable forprinting cotton.Y

a; The dyestuff thus ob tained represents in a 7i By" using in Examples1 and Q'instead of I the '-methyl fi-hal ogen-7-alkoxy-isatin-aLpha-halides the alpha-airylides; the'conden-v 'sation also may becarried outin water instead of in an organic solvent.

20 parts ofga lpha-anthrol(alpha-hy-.

droxyanthrac'zene) are dissolved in 200 parts of chlorobenzene whileheating. 22.6 parts;

of l-Inethyl-5 chloro-7-1nethoXy-isatin are converted into thecorresponding isatinalpha-chlorlde by heating withv a solution of 22 parts of phosphorous" pentachloride .in QOO parts of chlorobenz ene. Afterthe two solu- Y 'tions have'been mixed advantageously a H temperature offrom 40 C. to 50 C. the dyestuff separates at once in a crystallineform. In order to complete the formation of the dyestuf'f, the solutionis shortly heated to80 C. to 90 (land allowed to cool; The dyestufi isthen filtered by suction and washed free from chlorobenzene by means ofalco hol, The 2-anthracene-U-methyl-5-chlo-ro- TGmethoxy-Q-indol-indigothus obtained has the formula: V

then proceeding in the same way as in the said foregoing example theQ-anthracene-AJ- methyl 5-bromo-'Z'-methoxy-2 indol-indigo "isobtainedthe properties of which are very similar to those of the dyestuffprepared according to Example 3.. It dyes the fiber from to Example'3.

Weclaim: r

1. As new products, compounds of the following probable formula: g

A wherein R stands for a naphthylene or'phenylene residue, X forhydrogen or halogen, Y

,7 and Z for alkyl and Hlg for halogen, being vat dyestuffs of very goodfastness properties. 7

2. As new products, compounds of the following probable formula:

wherein X stands for ha1ogen, Z for alkyl and Hlg for halogen, being vatdyestuffs of very good fastness properties.

a'yellowish-brown vat greenish-blue tints of a somewhat more greenishshade than those obtained by the dyestuff prepared according 3. As newproducts, compounds of the following probable formula:

' wherein X and Hlg stand for chlorine or bromine, being vat dyestuffsof very good fastness properties.

As a new product, a compound of the following probable formula:

CH3 O 01 oo l czo He NH \\C/ eons 6 being a blue crystalline powderwhich dyes cotton from the vat beautiful fast greenishblue tints and isparticularly useful for printing cotton.

5. As a new product, the compound of the following probable formula:

being a blue powder which dyes cotton from ayellow vat'beautifulgreenish-blue tints and I is particularly suitable for printing cotton.

tures.

KARL THI-ESS. THEODORE MEISSNER. WERNER ZERWECK.

In testimony whereof, we aflix our signa-

